Use of Imaging Techniques for Viewing the Internal Structure of Rubberised Asphalt Mixtures

This paper presents the application of different imaging techniques for viewing the internal structure of rubberized asphalt mixture as road materials. Two imaging techniques were used to capture the internal structure images of its compacted samples i.e. X-ray Computed Tomography (non-destructive method) and Scanning Electron Microscope, SEM (destructive method). Since a lot of previous researchers have produced extensive works on the mechanical properties, therefore, this study is an attempt to introduce the microstructure of rubberized asphalt mixtures produced using dry process method. Two types of dry mixed rubberized asphalt mixture were prepared by modifying a Hot Rolled Asphalt Mixture (HRA 60/20) with different crumb rubber sizes. A mixture of conventional HRA 60/20 was also scanned for comparison. The illustrations are aimed to provide the researchers more information regarding their internal structure distribution.Keywords: Imaging techniques, X-ray Computed Tomography, Scanning Electron Microscope, Rubberised Asphalt Mixture

The Shaping Process Research on Crumb Rubber Modified Asphalt Mixture

The application of waste tire rubber in highway engineering mainly focuses on the modification of asphalt rather than the asphalt mixture, which restricts the application of waste tire. The addition of rubber has an effect on the performance of the mixture because of the obvious difference between rubber and mineral aggregates. This paper makes a research on the preparation technology of the specimens made of crumb rubber modified asphalt mixture in the laboratory by means of the study of selection of rubber、aggregate gradation、compaction temperature and so on. The effect of compaction was investigated in terms of the air void of the specimens under different preparation conditions. The optimal preparation process of rubberized asphalt mixture is put forward which could be proved to effectively control the pavement damages such as loose、stripping and so on.